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<article article-type="research-article" dtd-version="1.3" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xml:lang="ru"><front><journal-meta><journal-id journal-id-type="publisher-id">vetpress</journal-id><journal-title-group><journal-title xml:lang="ru">Аграрная наука</journal-title><trans-title-group xml:lang="en"><trans-title>Agrarian science</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">0869-8155</issn><issn pub-type="epub">2686-701X</issn><publisher><publisher-name>Редакция журнала "Аграрная наука"</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.32634/0869-8155-2025-400-11-83-90</article-id><article-id custom-type="elpub" pub-id-type="custom">vetpress-3897</article-id><article-categories><subj-group subj-group-type="heading"><subject>Research Article</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="ru"><subject>ЗООТЕХНИЯ</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="en"><subject>ZOOTECHNICS</subject></subj-group></article-categories><title-group><article-title>Влияние полиморфизмов генов гормона роста и тиреоглобулина на морфологический состав туши и биоконверсию кормов в мясную продукцию у герефордских бычков</article-title><trans-title-group xml:lang="en"><trans-title>The effect of growth hormone and thyroglobulin gene polymorphisms on the morphological composition of carcasses and the bioconversion of feed into meat products in Hereford bulls</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0001-8039-7471</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Джуламанов</surname><given-names>К. М.</given-names></name><name name-style="western" xml:lang="en"><surname>Dzhulamanov</surname><given-names>K. M.</given-names></name></name-alternatives><bio xml:lang="ru"><p> Киниспай Мурзагулович Джуламанов, доктор - сельскохозяйственных наук, руководитель селекционно-генетического центра по мясным породам скота </p><p> ул. 9 Января, 29, Оренбург, 460000 </p></bio><bio xml:lang="en"><p>Kinispay Murzagulovich Dzhulamanov, Doctor of Agricultural Sciences, Head of the Breeding and Genetic Center for Beef Cattle Breeds </p><p> 29 9th January Str., Orenburg, 460000 </p></bio><email xlink:type="simple">kinispai.d@yandex.ru</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0003-2295-5150</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Герасимов</surname><given-names>Н. П.</given-names></name><name name-style="western" xml:lang="en"><surname>Gerasimov</surname><given-names>N. P.</given-names></name></name-alternatives><bio xml:lang="ru"><p> Николай Павлович Герасимов, доктор биологических наук, ведущий научный сотрудник </p><p> ул. 9 Января, 29, Оренбург, 460000 </p></bio><bio xml:lang="en"><p> Nikolay Pavlovich Gerasimov, Doctor of Biology Sciences, Leading Researcher </p><p> 29 9th January Str., Orenburg, 460000 </p></bio><email xlink:type="simple">nick.gerasimov@rambler.ru</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0001-8609-8640</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Сафронова</surname><given-names>А. А.</given-names></name><name name-style="western" xml:lang="en"><surname>Safronova</surname><given-names>A. A.</given-names></name></name-alternatives><bio xml:lang="ru"><p> Александра Андреевна Сафронова, лаборант-исследователь </p><p> ул. 9 Января, 29, Оренбург, 460000 </p></bio><bio xml:lang="en"><p> Aleksandra Andreevna Safronova, Laboratory Researcher </p><p> 29 9th January Str., Orenburg, 460000 </p></bio><email xlink:type="simple">sovaalexandra@gmail.com</email><xref ref-type="aff" rid="aff-1"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>Федеральный научный центр биологических систем и агротехнологий Российской академии наук</institution><country>Россия</country></aff><aff xml:lang="en"><institution>Federal Research Centre of Biological Systems and Agrotechnologies of the Russian Academy of Sciences</institution><country>Russian Federation</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2025</year></pub-date><pub-date pub-type="epub"><day>19</day><month>11</month><year>2025</year></pub-date><volume>0</volume><issue>11</issue><fpage>83</fpage><lpage>90</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Джуламанов К.М., Герасимов Н.П., Сафронова А.А., 2025</copyright-statement><copyright-year>2025</copyright-year><copyright-holder xml:lang="ru">Джуламанов К.М., Герасимов Н.П., Сафронова А.А.</copyright-holder><copyright-holder xml:lang="en">Dzhulamanov K.M., Gerasimov N.P., Safronova A.A.</copyright-holder><license xml:lang="ru" license-type="creative-commons-attribution" xlink:href="https://creativecommons.org/licenses/by/4.0/" xlink:type="simple"><license-p>Данная работа распространяется под лицензией Creative Commons Attribution 4.0.</license-p></license><license xml:lang="en" license-type="creative-commons-attribution" xlink:href="https://creativecommons.org/licenses/by/4.0/" xlink:type="simple"><license-p>This work is licensed under a Creative Commons Attribution 4.0 License.</license-p></license></permissions><self-uri xlink:href="https://www.vetpress.ru/jour/article/view/3897">https://www.vetpress.ru/jour/article/view/3897</self-uri><abstract><p>Развитие новых направлений в селекции мясного скота ориентировано на создание высокопродуктивных животных, способных к эффективному производству продукции при рациональном использовании протеина и энергии корма.Цель работы — оценить влияние генотипа герефордских бычков по генам гормона роста и тиреоглобулина на морфологический состав туши и биоконверсию кормов в мясную продукцию.Генотипированных по генам GH и TG5 герефордских бычков (n = 9) выращивали до 21-месячного возраста. Гомозиготные носители V-аллели гена GH за период выращивания потребили на 6,4% (р = 0,09) больше сырого протеина корма, что сопровождалось лучшим развитием мышечной ткани на 25,6 кг (р &lt; 0,05) и скелета на 3,1 кг (р &lt; 0,05) и меньшим содержанием жира на 6,4 кг (р &lt; 0,05). У носителей LL-генотипа мякоть составляла 70,6% массы туши, что на 4,7–5,2% (р &lt; 0,05) меньше сверстников с V-аллелем. Между гомозиготными генотипами по гену GH установлена значительная разница по расходу обменной энергии корма на 1 кг прироста на уровне 9,82 МДж (р = 0,05). У бычков с VV-вариантом гена GH 10% сырого протеина корма использовались на построение тканей тела, что на 0,9% (р = 0,19) превышало показатель LL-генотипа. Количество жира в туше значительно (р &lt; 0,05) детерминировано генотипом молодняка по гену TG5. T-аллель ассоциировалась с интенсивным жироотложением, а C-аллель — с развитием мускулатуры. Генетические вариации по генам GH и TG5 могут быть использованы для улучшения эффективности разведения герефордского скота.</p></abstract><trans-abstract xml:lang="en"><p>The development of new directions in beef cattle breeding is focused on the creation of highly productive animals capable of efficient meat production with rational use of feed protein and energy.The aim of the work was to evaluate the effect of genotype by growth hormone and thyroglobulin genes on morphological composition of carcass and feed bioconversion into meat products in Hereford bulls. Hereford bulls genotyped for GH and TG5 genes (n = 9) were raised to 21 months of age. Homozygous carriers of the V allele of the GH gene consumed 6.4% (р = 0.09) more feed crude protein during the rearing period, accompanied by better muscle tissue development by 25.6 kg (р &lt; 0.05) and skeletal development by 3.1 kg (р &lt; 0.05), and lower fat content by 6.4 kg (р &lt; 0.05). In LL-genotype carriers, lean accounted for 70.6% of carcass weight, which was 4.7–5.2% (р &lt; 0.05) less than peers with the V allele. Between homozygous genotypes for GH gene there was a significant difference in feed metabolizable energy consumption per 1 kg of gain at the level of 9.82 MJ (р = 0.05). In bulls with VV-variant of GH gene 10% of feed crude protein was used for building body tissues, which was 0.9% (р = 0.19) higher than in LL-genotype. Carcass fat amount was significantly (р &lt; 0.05) determined by the TG5 gene genotype of young animals. T allele was associated with intensive fat deposition and C allele with muscle development. Genetic variation in GH and TG5 genes can be used to improve the breeding efficiency of Hereford cattle.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>герефордские бычки</kwd><kwd>генотип</kwd><kwd>морфологический состав туши</kwd><kwd>сырой протеин</kwd><kwd>обменная энергия</kwd><kwd>конверсия</kwd><kwd>мясная продукция</kwd></kwd-group><kwd-group xml:lang="en"><kwd>Hereford bulls</kwd><kwd>genotype</kwd><kwd>morphological composition of the carcass</kwd><kwd>crude protein</kwd><kwd>metabolizable energy</kwd><kwd>bioconversion</kwd></kwd-group><funding-group><funding-statement xml:lang="ru">Работа выполнена в соответствии с планом НИР на 2023–2025 гг. 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